According to the school, Michigan wore yellow against Navy back in 1928, but I've yet to see photographic evidence of that. They also wore leather helmets in that game, and I don't see that trend returning any time soon.

The trend toward alternate uniforms in college and pro football is nothing new. It's been a way to market new replica jerseys to the masses as well honor past traditions with 'throwback' or 'legacy' uniforms.

These were big during the Brady Hoke era at Michigan, as they donned 'legacy' uniforms in 2011 and 2012 as well as an all-blue uniform for a night game with Penn State in 2014 (one of the few they won that year). Overall, the team is 2-2 wearing alternate jerseys, losing to Alabama and Michigan State, while defeating Penn State and Notre Dame in them.